The Bank of England (BoE) will start to tighten the screws of monetary policy earlier than the Federal Reserve but will raise rates at a slower pace than its U.S. counterpart, according to Goldman Sachs.

The BoE will begin raising interest rates in the first quarter of 2015, while the Fed will wait until the third quarter, Goldman Sachs economists led by Huw Pill wrote in a note on Friday. The U.K. central bank appears more hawkish than its U.S. counterpart, they said.

"We expect U.K. rates to rise by around 75 basis points per year vs. 100-125 basis points per year in the U.S. [between 2015-2018]," Pill said.

The difference in the speed of interest rate hikes comes down to the different cyclical positions of each economy.

"Looking forward, we expect U.K. GDP (gross domestic product) growth and the pace of the decline in U.K. unemployment to moderate in the quarters ahead, both in absolute terms and relative to the U.S. All else equal, this would imply the need for a slower pace of tightening in the U.K.," Pill said.

Britain's economy grew 0.9 percent in the three months from April to June this year, the quickest increase since the third quarter of 2013. The U.S. economy, meanwhile, expanded at a 4.6 percent annual rate over the same period, its fastest pace in 2-1/2 years.

Historical trends

Looking back over the past quarter-century, the BoE has typically tightened more slowly than the Fed, according to Goldman.

On the basis of five tightening cycles for the U.K. and three for the U.S. over this period, the Fed has raised rates on average by 2.1 percentage points in the first year, while the BoE has raised rates by just 1.3 percentage points.

One reason they have risen more gradually is that the U.K.'s private sector has been more highly leveraged compared with the U.S. In addition, the average duration of debt held by British households is shorter than their American counterparts.

"This has meant that changes in policy rates in the U.K. have provided more 'bang for their buck' than has been the case for changes in policy rates in the U.S.," Pill said.

One risk to Goldman's forecast that the BoE will hike ratesfirst is that the growth slowdown in the euro zone may produce a bigger-than-expected drag on the U.K. economy.

"Inthis eventuality, the BoE could well delay the timing of its first interest rate increase," Pill said.

"For this reason, we have less confidence in our expectation that the U.K. will move first than we do in our expectation that, when rates to begin to rise, they will do so more gradually in the U.K. than in the U.S.," he said.